GCN Circular 25795
Subject
GRB 190919B: Swift/UVOT Upper Limits
Date
2019-09-20T20:58:25Z (5 years ago)
From
Frank Marshall at Swift/UVOT <marshall@milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and A. Beardmore (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190919B
28564 s after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 25788).
No optical afterglow consistent with the optical position
(Bolmer, GCN Circ. 25789; Tyurina et al. GCN Circ. 25791)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u_FC 28987 29196 206 >20.3
v 30258 36440 225 >19.6
b 29201 36022 301 >20.2
u 28987 35920 301 >20.7
w1 28564 35819 602 >20.8
m2 30471 30737 262 >20.3
w2 29416 36416 1204 >21.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).